関連する実験動画
Updated: Sep 10, 2025

07:00
Excitotoxic Stimulation of Brain Microslices as an In vitro Model of Stroke
Published on: February 4, 2014
8.6K
カイナート受容体GluK2-Neto2複合体の活性化
Shanti Pal Gangwar1, Maria V Yelshanskaya1, Laura Y Yen1,2
1Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY, USA.
Nature structural & molecular biology
|August 22, 2025
まとめ
構造は,カイナート受容体 (KAR) の活性化と,Neto2補助サブユニットの機能を調節する方法を示しています. Neto2結合は受容体のゲートダイナミクスを変化させ,興奮神経伝達と潜在的な治療目標に影響を与えます.
科学分野:
- 神経科学
- 構造生物学
- 分子薬理学
背景:
- カイナート受容体 (KAR) は,中枢神経系における刺激性神経伝達とシナプス可塑性にとって不可欠なイオノトロプ的グルタミン酸受容体である.
- KARの機能障害は神経学的および精神学的障害と関連しており,重要な治療目標となっています.
- Neto1とNeto2のような補助サブユニットは,KARの機能,トラフィック,およびローカライゼーションを調節します.
研究 の 目的:
- GluK2 カイナート受容体の活性化の構造的メカニズムを解明する.
- KARの構造と機能に対するNeto2補助サブユニットの調節作用を調査する.
主な方法:
- 構造を決定するために時間解像度の高い冷凍電子顕微鏡 (cryo-EM) が使用された.
- ネズミのGluK2 KARの構造は,アポ,アゴニスト結合 (カイナート),およびアロステル調節器結合 (BPAM344) 状態で解明されました.
- 構造は,Neto2補助サブユニットの存在と不在の両方で解消されました.
主要な成果:
- Neto2結合は,個々のリガンド結合ドメイン (LBD) またはイオンチャネル孔の構造を変更しません.
- Neto2結合は,活性化時にLBDダイマー間のインターフェースの締め付けを阻害する.
- Neto2結合は,カイナート受容体の非活性化運動を著しく遅らせます.
結論:
- この研究は,カイナート受容体の活性化ゲートに関する原子レベルの洞察を提供します.
- Neto2は,KARゲートダイナミクスと無効化率に影響を与える重要な調節器として機能します.
- これらの発見は,KARの機能とこれらの受容体を標的とする潜在的な治療戦略の理解を深める.
関連する概念動画
Ligand-Gated Ion Channel Receptor: Gating Mechanism
2.6K
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
2.6K
cAMP-dependent Protein Kinase Pathways
6.6K
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
6.6K
Enzyme-linked Receptors
79.9K
Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
79.9K
Ligand-gated Ion Channels
12.7K
Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
12.7K
Non-gated Ion Channels
7.1K
Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism....
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism....
7.1K
GPCRs Regulate Adenylyl Cylase Activity
5.9K
Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
5.9K

